A WIFI radio frequency circuit, network component and electronic device

Abstract

This application discloses a WIFI radio frequency circuit, network component, and electronic device. The proposed solution is based on an LC high-pass filter circuit composed of an LC resonant structure. It uses a simpler and lower-cost LC high-pass filter circuit to replace the existing 2.4G bandpass filter unit and the low-frequency port of the combiner. By superimposing the high-frequency passing characteristics of the LC high-pass filter circuit with the low-frequency passing characteristics of the low-frequency port of the combiner, the bandpass characteristics required by the WIFI radio frequency circuit are achieved, thereby reducing the hardware cost of the WIFI radio frequency circuit.

Description

Technical Field

[0001] This application relates to the field of communication electronic equipment technology, and in particular to a WIFI radio frequency circuit, network component and electronic equipment. Background Technology

[0002] In WCN (Wireless Connectivity Network) systems, Wi-Fi radio frequency (RF) circuits serve as a crucial hub for wireless communication and typically employ a traditional discrete component architecture. However, with the increasing mass production of IoT devices, the demand for Wi-Fi RF circuits is rising. This increased production capacity necessitates increasingly stringent cost control requirements for Wi-Fi RF circuit products. Therefore, further reducing the equipment cost of Wi-Fi RF circuits has become a pressing technical challenge for those skilled in the art. Utility Model Content

[0003] This application provides a WIFI radio frequency circuit, network component, and electronic device to achieve the technical effect of further reducing the equipment cost of the WIFI radio frequency circuit.

[0004] To achieve the above technical effects, the first aspect of this application provides a WIFI radio frequency circuit, including: a WCN chip, an LC high-pass filter circuit, a combiner, and a radio frequency antenna, wherein the radio frequency antenna is connected to the combining port of the combiner;

[0005] The low-frequency port of the combiner is connected to the 2.4G signal port of the WCN chip, and the high-frequency port of the combiner is connected to the 5G signal port of the WCN chip.

[0006] The LC high-pass filter circuit is located between the 2.4G signal port of the WCN chip and the low-frequency port of the combiner.

[0007] Preferably, the WCN chip further includes: a signal processing module;

[0008] The signal processing module is configured to perform peak factor reduction processing on the signal output by the WCN chip.

[0009] The second aspect of this application provides a WIFI network component, which includes: the WIFI radio frequency circuit as provided in the first aspect of this application.

[0010] A third aspect of this application provides an electronic device, characterized in that the electronic device includes: a WIFI network component as provided in the second aspect of this application.

[0011] As can be seen from the above technical solutions, this application has the following advantages:

[0012] The proposed solution is based on an LC high-pass filter circuit with an LC resonant structure. It replaces the existing 2.4G bandpass filter unit with the low-frequency port of the combiner by using a simpler and lower-cost LC high-pass filter circuit. By superimposing the high-frequency passing characteristics of the LC high-pass filter circuit with the low-frequency passing characteristics of the combiner's low-frequency port, the bandpass characteristics required by the WIFI RF circuit are achieved, thereby reducing the hardware cost of the WIFI RF circuit. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the existing WIFI radio frequency circuit based on the WCN architecture.

[0015] Figure 2 This is a schematic diagram of a WIFI radio frequency circuit provided in this application.

[0016] Figure 3 This is a schematic diagram of a simulation circuit structure based on a WIFI radio frequency circuit structure provided in this application.

[0017] Figure 4 This is a graph of S-parameters measured after removing the filter from the existing WIFI RF circuit structure.

[0018] Figure 5 Based on Figure 3 The S-parameter curves obtained from the simulation circuit structure are shown.

[0019] Figure 6 The figure shows the simulation test results for the insertion loss parameters of a conventional bandpass filter unit.

[0020] The reference numerals in the attached figures are as follows:

[0021] D. Combiner; ANT. Radio frequency antenna; F. LC LC high-pass filter circuit; F SAW Bandpass filter. Detailed Implementation

[0022] like Figure 1As shown, current WCN architectures consistently employ a 2.4GHz Wi-Fi filter design. The TRX (transmit / receive) filters used in the 2.4GHz Wi-Fi band are typically independent bandpass filters. While this design ensures basic wireless communication performance, there is still room for optimization. With increasing market competition and rising cost control demands, reducing the equipment cost of Wi-Fi RF circuits has become a pressing technical challenge for those skilled in the art.

[0023] To address these issues, researchers discovered that the core functionality of a bandpass filter can be achieved by combining components with different frequency response characteristics. Analysis of the combiner port frequency characteristics revealed that the low-frequency port inherently possesses low-frequency pass characteristics. Theoretically, by superimposing a high-pass filter characteristic at the front end, an equivalent bandpass effect can be achieved. Based on this idea, a low-cost LC high-pass filter circuit is proposed to replace the traditional single bandpass filter unit. This circuit utilizes its high-frequency pass characteristics to superimpose the low-frequency pass characteristics of the combiner's low-frequency port, thus constructing a bandpass response that meets the requirements of Wi-Fi RF circuits.

[0024] In view of this, this application provides a WIFI radio frequency circuit, network component and electronic device to achieve the technical effect of further reducing the equipment cost of WIFI radio frequency circuit.

[0025] To make the technical objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] Please see Figure 2 This application provides a WIFI radio frequency circuit, including: a WCN chip and an LC high-pass filter circuit F. LC The system consists of a combiner D and an RF antenna ANT, where the RF antenna ANT is connected to the combining port of combiner D. The low-frequency port of combiner D is connected to an LC high-pass filter circuit F. LC Connect to the 2.4GHz signal port of the WCN chip, and the high-frequency port is directly connected to the 5GHz signal port of the WCN chip.

[0029] The WCN chip refers to a baseband processing chip that integrates wireless communication functions. Specifically, it can be implemented using a SoC chip that supports dual-band signal processing, used to generate and modulate wireless signals in the 2.4GHz and 5GHz bands. LC high-pass filter circuit F LC A high-pass filter circuit, composed of an inductor-capacitor network, can be implemented using a second-order LC series resonant structure. Its cutoff frequency is set below the lower limit of the 2.4GHz band to filter out low-frequency interference signals. A combiner (D) is a passive device that combines multi-band signals. It can be implemented using a diplexer duplexer structure, allowing 2.4GHz signals to pass through its low-frequency port and 5GHz signals to pass through its high-frequency port. A radio frequency antenna (ANT) is a transducer used for electromagnetic wave radiation and reception. It can be implemented using an inverted-F antenna or a ceramic antenna to perform wireless signal transmission and reception functions.

[0030] Specifically, the 2.4GHz signal generated by the WCN chip first passes through the LC high-pass filter circuit F. LC After filtering out out-of-band low-frequency noise, the signal then enters the low-frequency port of combiner D. Utilizing the low-frequency pass capability of combiner D itself, it is connected to the front-end LC high-pass filter circuit F. LC After the high-frequency characteristics of the two signals are superimposed, a bandpass response is formed in the 2.4GHz band. The 5GHz signal is directly transmitted to the RF antenna ANT through the high-frequency port of the combiner D. After the two frequency band signals are combined at the combiner port, they are transmitted uniformly by the RF antenna ANT. This scheme replaces the independent bandpass filter F with the superposition of device characteristics. SAW This simplifies the circuit structure while maintaining signal quality.

[0031] To more clearly demonstrate the advantages of the circuit structure provided in this application, this application is based on... Figure 1 The existing WIFI RF circuit structure shown is compared with the WIFI RF circuit structure provided in this application through simulation tests. The simulation circuit structure of the WIFI RF circuit structure provided in this application can be found in [reference needed]. Figure 3 , Figure 3 The parameters of each component shown are as follows: L6623=1.5NH, C6603=1.5PF, L6625=4.3NH, C6605=0.75PF, L6624=2.7NH, C6604=3PF, L6626=1.8NH, C6606=2.7PF. The test results are as follows:

[0032] like Figure 4 As shown, Figure 4 The curve represents the combiner DS parameter curve. As can be seen from the graph, based on... Figure 1 The simulation results for the structure shown are as follows, with the filter removed and without replacing it with an LC filter circuit: S(2,1) is the 2.4G path, which has only low-pass characteristics and no band-pass effect; S(3,1) is the 5G path.

[0033] like Figure 5 As shown, Figure 5 The curve represents the combiner D+LC high-pass filter circuit F. LC The S-parameter curve, based on Figure 3 The simulation results obtained from the structure shown are as follows: S21 has bandpass capability, which is consistent with the FCC certification standards. Figure 4 and Figure 5 Actual performance: 2.4G in the channel 11 sideband. Figure 5 The results shown are compared to Figure 4 The results show that the backoff power is 2dB, and the other channels are not significantly affected.

[0034] like Figure 6 As shown, the conventional bandpass filter F SAW The insertion loss parameter of a single unit is generally above 1dB, and a classic value of 1.2dB can be used. Figure 4 and Figure 5 The difference between the dBS(2,1) values ​​shown at sampling point m1 can be used to obtain the LC high-pass filter circuit F used in this application. LC The insertion loss parameter is 0.488-0.373=0.115dB. By comparing the two, it can be concluded that the circuit structure provided in this application also achieves the effect of reducing the insertion loss of WiFi 2.4G path by 1dB, which can better improve the user's network experience in weak field conditions.

[0035] This solution utilizes an LC high-pass filter circuit F LC In synergy with the inherent frequency characteristics of combiner D, it achieves an equivalent bandpass filter function. Statistically, compared to the traditional bandpass filter F... SAW This single-unit design scheme, while ensuring good out-of-band rejection of the overall circuit, achieves a cost reduction of 5 cents per unit. Through the above technical solution, this application effectively reduces the production cost and assembly complexity of the WIFI RF circuit, while maintaining signal transmission quality. LC high-pass filter circuit F LC The cooperative operating mode with the low-frequency port of combiner D ensures bandpass characteristics in the 2.4GHz band while avoiding the use of a high-cost bandpass filter F. SAW This single-unit design is suitable for mass-produced IoT devices. By optimizing component combinations, this structural design achieves superior cost-effectiveness while maintaining comparable performance.

[0036] In the above-described basic embodiments, this application further proposes that the WCN chip also includes a signal processing module; the signal processing module is used to perform peak factor reduction processing on the signal output by the WCN chip.

[0037] Among these, crest factor reduction technology can be implemented using existing signal processing algorithms such as digital predistortion algorithms. This involves detecting the peak power of the signal waveform and dynamically compressing it to reduce the peak-to-average power ratio (PAPR). The signal processing module refers to an embedded digital signal processing unit, which can be implemented using programmable logic devices or application-specific integrated circuits (ASICs). This module is configured to perform real-time signal processing.

[0038] Specifically, after integrating a signal processing module within the WCN chip, the baseband signal undergoes real-time analysis before being sent to the combiner D. The built-in CFR algorithm performs pre-correction on the signal waveform, clipping peak power exceeding a preset threshold while maintaining effective signal power, thereby reducing the peak-to-average power ratio (PAPR) of the signal waveform. This processing method improves the signal strength after passing through the LC high-pass filter circuit F. LC The resulting signal spectrum is more concentrated, effectively suppressing the diffusion of high-frequency harmonic components into the out-of-band region.

[0039] This solution adds an active digital signal processing stage before physical filtering. Through the synergistic effect of algorithm processing and hardware filtering, it achieves better out-of-band radiation suppression while maintaining signal modulation accuracy. This technical solution enables the application to effectively reduce the radiation intensity of radio frequency signals in non-operating frequency bands while ensuring the modulation quality of the Wi-Fi signal. Especially in high-power transmission scenarios, by dynamically adjusting the CFR processing parameters, it avoids the degradation of error vector amplitude caused by excessive clipping and ensures that the transmitted signal meets the spectral template requirements, thereby improving the overall compatibility and stability of the radio frequency system.

[0040] The above is a detailed description of an embodiment of a WIFI radio frequency circuit provided in this application. The following is a detailed description of an embodiment of a WIFI network component and electronic device provided in this application, as follows:

[0041] This application further proposes a WIFI network component, which includes a WIFI radio frequency circuit. The circuit consists of a WCN chip, an LC high-pass filter circuit, a combiner, and a radio frequency antenna. The radio frequency antenna is connected to the combiner port. The low-frequency port of the combiner is connected to the 2.4G signal port of the WCN chip, and the high-frequency port is connected to the 5G signal port of the WCN chip. The LC high-pass filter circuit is disposed between the 2.4G signal port of the WCN chip and the low-frequency port of the combiner. The WCN chip integrates a signal processing module, which processes the output signal based on a preset CFR processing logic. The processing logic includes generating and superimposing cancellation pulses on the single-sideband signal when the device's WIFI is operating in the edge channel.

[0042] Among them, the WIFI network component refers to the modular unit used to realize wireless communication function. Specifically, it can be implemented by an architecture in which integrated radio frequency circuits and signal processing algorithms work together. Its function is to integrate radio frequency circuits and signal processing functions into an independent component, which facilitates device integration and reduces costs.

[0043] The LC high-pass filter circuit refers to a filter circuit composed of inductors and capacitors, specifically implemented using a second- or third-order LC network structure. Its function is to replace a traditional single bandpass filter by superimposing the high-frequency pass characteristics with the low-frequency pass characteristics of the combiner's low-frequency port, thus simplifying the circuit structure. The CFR processing logic refers to a signal processing algorithm based on crest factor reduction technology, specifically implemented using a pulse cancellation mechanism with dynamic threshold control. Its function is to reduce out-of-band radiation intensity by suppressing the signal's sideband spectral components.

[0044] Specifically, this Wi-Fi network component integrates radio frequency circuitry with a signal processing module. When implementing wireless communication, the LC high-pass filter circuit handles filtering in the 2.4 GHz band, while the signal processing module dynamically adjusts the CFR processing range based on channel conditions. When the device is detected operating in an edge channel, it generates out-of-phase cancellation pulses only for one sideband, steepening the spectral curve through signal superposition. This processing method, combined with the out-of-band rejection characteristics of the LC filter circuit, works synergistically to maintain communication quality while reducing hardware costs.

[0045] This solution reduces the number of independent filters by complementing the characteristics of the LC high-pass filter circuit and the combiner. Existing technologies typically apply CFR processing across the entire frequency band, which can easily lead to signal quality degradation. This solution limits processing to one side of the edge channel, ensuring out-of-band suppression while avoiding excessive impact on modulation performance. Through the above technical solutions, this application can reduce the material cost and assembly complexity of the WIFI RF module in the context of large-scale mass production of IoT devices through hardware structure optimization and algorithm co-design, while maintaining in-band power and spectrum compliance of the communication signal through a dynamic sideband processing mechanism.

[0046] This application further proposes an electronic device, including a WIFI network component. The WIFI network component includes a WIFI radio frequency (RF) circuit, which comprises a WCN chip, an LC high-pass filter circuit, a combiner, and an RF antenna. The RF antenna is connected to the combiner port. The low-frequency port of the combiner is connected to the 2.4G signal port of the WCN chip, and the high-frequency port is connected to the 5G signal port of the WCN chip. The LC high-pass filter circuit is positioned between the 2.4G signal port of the WCN chip and the low-frequency port of the combiner. The electronic device refers to a terminal device with wireless communication capabilities, specifically a smartphone, tablet, or IoT device, which integrates the WIFI network component to achieve wireless data transmission.

[0047] The WIFI network component refers to a functional module that includes radio frequency circuits, baseband processing modules, and antennas. It can be implemented using PCB onboard circuits or as an independent module to complete the transmission and reception of wireless signals.

[0048] Among them, the LC high-pass filter circuit refers to a filter circuit composed of inductors and capacitors. Specifically, it can be implemented using a topology of series inductors and parallel capacitors, and is used to filter out low-frequency interference signals.

[0049] Among them, the combiner refers to the device that combines multi-band signals. Specifically, it can be implemented using a diplexer structure, which transmits signals of different frequency bands through low-frequency ports and high-frequency ports respectively.

[0050] Specifically, in electronic devices, the Wi-Fi radio frequency circuit replaces the traditional bandpass filter unit with an LC high-pass filter circuit. Combined with the frequency selectivity of the combiner, an equivalent bandpass filtering effect is achieved. The 2.4G signal output by the WCN chip is filtered to remove low-frequency noise by the LC high-pass filter circuit, and then combined with the 5G signal in the combiner before being transmitted through the radio frequency antenna. This solution simplifies the filter circuit structure, reduces the number of discrete components, and maintains signal transmission performance through the synergistic effect of the combiner and the LC filter circuit.

[0051] This solution replaces the traditional architecture with a combination of an LC high-pass filter circuit and a combiner, reducing circuit complexity and component costs while maintaining signal bandpass characteristics. Through this technical solution, this application achieves low-cost design of WIFI RF circuits in electronic devices, reducing the number of discrete components through structural optimization while maintaining wireless communication performance, making it suitable for mass-produced consumer electronic devices.

[0052] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A WIFI radio frequency circuit, characterized in that, include: The system comprises a WCN chip, an LC high-pass filter circuit, a combiner, and an RF antenna, wherein the RF antenna is connected to the combining port of the combiner; The low-frequency port of the combiner is connected to the 2.4G signal port of the WCN chip, and the high-frequency port of the combiner is connected to the 5G signal port of the WCN chip. The LC high-pass filter circuit is located between the 2.4G signal port of the WCN chip and the low-frequency port of the combiner.

2. The WIFI radio frequency circuit according to claim 1, characterized in that, The WCN chip also includes: a signal processing module; The signal processing module is configured to perform peak factor reduction processing on the signal output by the WCN chip.

3. A WIFI network component, characterized in that, The WIFI network component includes: the WIFI radio frequency circuit as described in any one of claims 1 to 2.

4. An electronic device, characterized in that, The electronic device includes the WIFI network component as described in claim 3.

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